A submarine is descending to examine the seafloor 2,100 feet below the surface. It takes the submarine 2 hours to make this descent. Write an equation to represent the relationship between the submarine's elevation and time.
Another submarine’s descent can be represented as y=-240x, where y is the elevation and x is time in hours. How long will it take this submarine to make the descent?

I know the answer because descending means going down so 2100 is the big number and its negative to if you do -2100 divided by 2 then you will get -1050.

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raphealnwobi raphealnwobi · Answer 2 · 2022-02-18T12:01:14+01:00

It would take the submarine 8.75 hours to make the descent of 2100 feet.

Linear equation

A linear equation is in the form:

y = mx + b

where m is the rate of change, y, x are variables, and b is the y intercept.

Let y represent the level of the submarine after x hours.

It takes the submarine 2 hours to make a descent of 2100 feet, hence:

y = mx

-2100 = 2m

m = -1050

y = -1050x

Given the equation y = -240x, for 2100 feet descent:

-2100 = -240x

x = 8.75 hours

It would take the submarine 8.75 hours to make the descent of 2100 feet.

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